feat(equation-and-linear-solve): step 0 — symmetric-csr-assembly

src/fesa/model/domain.cpp

@@ -55,6 +55,24 @@ const Node& Domain::node(const EntityOrigin& origin) const {
     return nodes_[found->second];
 }
 
+const IsotropicElastic& Domain::material(const MaterialId id) const {
+    const auto found = material_indices_.find(id.value());
+    if (found == material_indices_.end()) {
+        throw std::out_of_range{
+            "Material ID is not present in the Domain."};
+    }
+    return materials_[found->second];
+}
+
+const BeamSection& Domain::section(const SectionId id) const {
+    const auto found = section_indices_.find(id.value());
+    if (found == section_indices_.end()) {
+        throw std::out_of_range{
+            "Section ID is not present in the Domain."};
+    }
+    return sections_[found->second];
+}
+
 Domain::OriginKey Domain::origin_key(const EntityOrigin& origin) {
     return {origin.instance_name, origin.local_label};
 }